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holes to hold adjustment. Push throttle cable until
throttle arm makes contact with choke arm. Tighten
cable clamp. Remove pin if used.
1
2
3
4
Figure 21
1. Throttle arm
2. Choke arm
Cleaning Cooling System
After every 75 operating hours, clean dirt and chaff from
cylinder, cylinder head fins and from around carburetor
and linkage. Also remove debris from air intake slots on
recoil housing. This will ensure proper cooling and best
engine performance.
Cleaning Muffler And Exhaust
Port
Clean end of muffler pipe and exhaust port after every 75
hours of operation.
CAUTION
POTENTIAL HAZARD
Muffler and engine surface become hot when
mower is in operation.
WHAT CAN HAPPEN
Contact with hot muffler surface could cause a
burn.
HOW TO AVOID THE HAZARD
Clean muffler and exhaust port only after
engine and muffler are cool.
780
3. Aligned holes
4. Throttle bracket
17
1. Use hard wood scraper and remove carbon from end of
muffler pipe (Fig. 22).
1
Figure 22
1. Screws, nuts and
lockwashers
2. Remove screw, two nuts, and lockwashers (Fig. 22).
Slide muffler off mounting pins.
3. Pull wire off spark plug. Slowly pull recoil starter so
piston covers exhaust port (Fig. 23).
4. Clean carbon from exhaust port (Fig. 23) with flat,
hard wood scraper.
IMPORTANT: Do not use a metal scraper or similar
object to clean exhaust port because accidental damage
to the piston or cylinder could easily occur.
5. Reinstall muffler with screw, (2) nuts and lockwashers
(Fig. 22). After cleaning exhaust port, make sure
muffler gasket is still usable.
Figure 23
1. Exhaust port
Adjusting Wheel Drive
If mower does not self–propel or has a tendency to creep
forward when drive is not engaged, adjust wheel drive
control knob on rear of gear box.
2
202
2. Muffler pipe
1
203
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